添加全局水印

2022-02-18 18:02:11 +08:00
parent a2e0091b8b
commit db223cc98c
7 changed files with 125 additions and 40 deletions
@@ -0,0 +1,48 @@
+let watermark = {}
+let setWatermark = (str) => {
+  let id = '1.23452384164.123412415'
+
+  if (document.getElementById(id) !== null) {
+    document.body.removeChild(document.getElementById(id))
+  }
+
+  let can = document.createElement('canvas')
+  can.width = 190
+  can.height = 120
+
+  let cans = can.getContext('2d')
+  cans.rotate(-30 * Math.PI / 180)
+  cans.font = '15px Vedana'
+  cans.fillStyle = '#f4f4f4'
+  cans.textAlign = 'left'
+  cans.textBaseline = 'Middle'
+  cans.fillText(str, can.width / 20, can.height)
+
+  let div = document.createElement('div')
+  div.id = id
+  div.style.pointerEvents = 'none'
+  div.style.top = '-30px'
+  div.style.left = '0px'
+  div.style.position = 'absolute'
+  div.style.zIndex = '1'
+  div.style.width = '100%'
+  div.style.height = '100%'
+  div.style.background = 'url(' + can.toDataURL('image/png') + ') left top repeat'
+  document.getElementsByClassName('main')[0].appendChild(div)
+  return id
+}
+
+// 该方法只允许调用一次
+watermark.set = (str) => {
+  let id = setWatermark(str)
+  setInterval(() => {
+    if (document.getElementById(id) === null) {
+      id = setWatermark(str)
+    }
+  }, 2000)
+  window.onresize = () => {
+    setWatermark(str)
+  }
+}
+
+export default watermark